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DEM - Demonstration contracts

Obiettivo

Implementation of an innovative techniques set allowing :- to increase the geothermal covering of the heat network to 26000 dwellings in the longer time,- to suppress the fuel local consumption with respect to the environment,- to replace the individual heating boilers to the advantage of geothermics supplemented by a central gas boiler,- to allow an independent electricity production from gas for the supplying of the drilling pumps,- to optimize the geothermal heat covery and reduce the specific exploitation costs.The main results to be aimed for this project are the following :ENERGY STAKES :- Substitution of local boilers using fuel : 4,270 TOE/yr- Substitution of electricity by gas : 1,657 TOE/yr- Energy savings/Total : 2,334 TOE/yr- Energy savings/Project : 1,112 TOE/yrENVIRONMENTAL DEMANDDecrease of CO2 totalizes 5535 tons/yr for phase A.ECONOMICAL DEMAND- Innovative project extra-cost : 21,915 kF/yr- Exploitation gain : 3,694 kF/yr- Return time : 5,9 yr.The heat network extension concerns the two neighbouring towns that are Villejuif and Fresnes. Three phases are considered for this extension over a period of 4 to 5 years, the total potential of supplementary connecting being of 12500 dwellings.The phase A project concerns the implementation from a cogeneration installation with a gas system to a daily storage of heat.The cogeneration installation allows electricity production with gas motor for the supplying of the drilling pumps with a simultaneous heat recovery about 100 deg. C. A cogeneration station of 4,000 kWe will be install near each of the both geothermal stations.The daily storage of heat aims to regulate the driving of the production equipment and increase their energetic efficiency and in this to increase the heat recovery from geothermy and cogeneration. The storage will be able to effected under the form of hot water under pressure with tanks with stratifications, for a volume of 200 m3 a station.This storage system may allow to store the excess geothermal heat during the day and to destore it during the night, avoiding the supply of heat by gas back up.